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`sys` Schema

Starting from v8.0.0, TiDB provides the sys schema. You can use the views in sys schema to understand the data in the system tables, INFORMATION_SCHEMA, and PERFORMANCE SCHEMA of TiDB.

Tables for MySQL compatibility

Table name	Description
`schema_unused_indexes`	Records indexes that have not been used since the last start of TiDB.

sys Schema

Tables for MySQL compatibility

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`sys` Schema